This is the 11798th most frequent Russian word.
закрытием
"Закрытием" means "closing" or "closure."
Here, 'закрытием' is used in the Instrumental case, indicating the action of the store closing.
После закрытием магазина мы отправились домой.
After the store's closure, we went home.
In this sentence, 'закрытием' is again in the Instrumental case, describing the completion of the project closure.
Он был доволен закрытием проекта, который принес большие убытки.
He was pleased with the closure of the project that caused major losses.
Here, 'закрытием' represents the Instrumental case form of 'закрытие,' used to discuss the act of closing the exhibition.